Patent EP-3594607-A1 (EP)
Inventor: SHARKOV OLEKSANDR KOSTIANTYNOVYCH
IPC: F41A17/46
Filed: 2017-03-17
Abstract: The invention relates to firearms and can be used in various types of small arms, for example, in pistols, submachine guns, machine guns, rifles, machine guns. The proposed universal percussion trigger mechanism, comprising a trigger housing (22) with a magazine (1), safety catch (3), magazine latch (7), firing pin (8), trigger bar (23), spring (12) of the trigger bar, universal percussion mechanism (38), which is fixed in the receiver (20), and consists of a bracket for universal percussion mechanism (16), cocking piece (17) with a cocking indicator mounted on the axis of the cocking piece (18) and spiral mainsprings (19), sear (11) and a single-shot sear (27). What is new is that the safety catch (3) is made in the form of a rectangular rod (64), on the side of which a large slot (65) and a small slot (66) are made, designed to interact with the safety protrusion (85) of the trigger bar (23); the magazine latch (7) is made with a washer (78), with a lever (79) and a slot (80), where in the center of the washer (78) a rod (81) is made, which acts as the axis on which the magazine latch (7) swings in the trigger housing (22) with a locking protrusion (82); the cocking piece (17) is made with cylindrical protrusions (43) with a through hole (44) and consists of the base of the cocking piece (45), the percussion platform (46), which interacts with the firing pin (8) and the bulge (33) at the end of the lock frame (31), the cocking piece tail (47) and the cocking piece tip (48), which interacts with the upper surface of the protrusion (97) of the sear (11) and the rear radius surface (109) of the single-shot sear (27); the sear (11) contains a bar (96), in front of which a protrusion (97) is made at the top, a support platform (98) is made at the bottom of the protrusion (97), and a through hole (99) is made at the side of the sear (11); the single-shot sear (27) comprises a square rod (103), on the back of which a T-shaped protrusion is made, which consists of a section (104) of the sear and the rack (105) of the sear; the universal percussion mechanism bracket (16) is made in the form of two plates (58) connected with a transverse plate (59) at an acute angle (d59) relative to the horizontal axis of the bracket (16); the trigger bar (23) is made with trigger (84) with a safety protrusion (85) interacting with the safety catch (3), with a front protrusion (86) that interacts with the trigger housing (22), and the base of the trigger (87) is connected with thrust (89); the multifunctional switch (28) contains a trapezoidal bar (110), the front end of said trapezoidal bar (110) is made in the form of a rack (111), which interacts with the hook-shaped protrusion (32) of the lock frame (31), with a horizontal protrusion (112), which interacts with the receiver (20), and the T-shaped protrusion is made in the rear portion of the trapezoidal bar (110), and a protrusion (114) is made on the rear lower surface of the trapezoidal bar (110), which acts as a fire switching lever; the axis of the multifunctional switch (29) is made in the form of a conical section (116) with a spherical head (117). 
     The proposed design of the percussion trigger mechanism was implemented on test models for weapons with a magazine in the pistol grip, for weapons made according the bull-pup scheme and for weapons made with a side handle, and showed the ease of use, the ability to adjust the trigger force and prevent accidental fire.